import type { AgentSession } from "../../core/agent-session.js";
import type { WorkflowActivityFrame } from "../../core/extensions/workflow-events.js";
/**
 * Forward the engine's workflow activity to the host that owns the terminal. The host reports it as
 * program status, which needs each root's state and outcome but never its graph, so frames that
 * change only the graph are not sent.
 */
export declare function forwardWorkflowActivity(session: AgentSession, write: (line: string) => void): () => void;
/**
 * The host's view of the engine's workflow activity. The engine publishes its snapshot as soon as it
 * binds, which can be before the host attaches an observer, so the host keeps the frames folded into
 * one current snapshot and replays that to every observer that attaches later.
 */
export declare class WorkflowActivityMirror {
    private cursor;
    private availability;
    private readonly roots;
    apply(frame: WorkflowActivityFrame): void;
    /** The snapshot a late observer starts from; absent until the engine published something. */
    current(): WorkflowActivityFrame | undefined;
    reset(): void;
}
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